Design Of The Electronic Trip Units - Siemens SENTRON 3WL10 Series Manual

2.4.1

Design of the electronic trip units

Electronic trip units of the 3-series
The following figure shows the maximum possible equipment of an ETU of the 3-series.
Depending on the ETU used, the number of rotary coding switches and LEDs can vary.
①
②
③
④
⑤
Display elements
ETU readiness can be indicated via the LED ACT.
Alarms and trips are indicated via the LEDs in the area of the rotary coding switches.
You will find the precise description and meaning of the LED states in Chapter Alarms
(Page 161).
Operator controls
The electronic trip units of the 3-series are equipped with rotary coding and DIP switches.
● DIP switches: Setting the neutral protection and the line frequency
● Rotary coding switch: Parameterizing the protection functions
See also
Entering parameters (Page 155)
Air circuit breaker 3WL10
Manual, 11/2017, L1V30499596002-01
Active LED ACT
DIP switch
Rotary coding switch with LED
Test key
Connection socket for test devices TD310, TD410, and TD420
Description
2.4 Electronic trip unit ETU
35